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Negative current feedback with the application to Gm-c filter

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somilankit

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in this project, i m trying to implement 4th order low pass gm-c filter using 0.18um CMOS technology. i have proposed negative current feedback OTA circuit which is taken from the published paper of IEEE. In this circuit, they didn't give us the W/l ration abd Vb of M13 and Vcm of M15 and Vt 0f M17. So all these value i have taken as per my knowledge but i didn't get the satisfactory result after implementing fourth order gm-c filter. i m attaching all my work till date. Plzzz check it and show me the next path. ankittrail wl.pngfilter(OTA).png
i m not getting the frequency even at 1Mhz. plzzz help me out
 

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